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BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > 335i vacuuming at -4.0



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      04-11-2012, 11:36 PM   #1
NSFW 335i
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335i vacuuming at -4.0

Hello,
I am not sure if anything is wrong, but when I let go of my accelerator, or at idle, my boost gauge will read that I am vacuuming at only around -4.0. Is something wrong? or is this normal? I see other people vacuuming at around -22.

If so, what could be potentially wrong with the car?
I have BOV's installed, but this reading was before that.

JB3
full Miltek exhaust
catless downpipes
BOVs
K&N intake


Reading on P3 gauge.

thanks!
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      04-12-2012, 04:20 AM   #2
J02 335i
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More then likely you have a vacuum leak or a faulty gauge.
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      04-13-2012, 04:44 PM   #3
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It is got to be a gauge problem if the car idles well and has power brakes.

I used to own a muscle car that idled at 8-9" Hg. It would idle very rough and you needed a vacuum pump for the brakes.
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      04-14-2012, 12:02 AM   #4
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I found the problem, it was programming in the gauge. Lol i had to change a setting.
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08 E92 335i AW Coral Red 6MT Fully Loaded|AA DP|BMS DCI|JB4 G5|Milltek full exhaust|SSK|Stett CP|Tial bov|Tinted window|HID Fogs|M3 Front|Mtech Rear|VMR V710|ACS pedals|V1 hardwired|BMW Performance Parts-Shift knob-Boot-E-Brake-SteeringWheel|CF Parts CSL trunk-V35 Hood-ACS roofspoiler|Red Pre-LCIs|Tow hook Plate|Clutch Stop|
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